GM77 Barcode and QR Code Scanning Module - DFRobot Electronics
Yhdaa Arduino 2d Mini Raspberry Pi Barcode Scanner Embedded 1d Qr Bar Code Reader Module With Rs232/usb/ttl/micro Usb Interface - Scanners - AliExpress
Block diagram of the system | Download Scientific Diagram
QR Code Scanner using Raspberry Pi and OpenCV
Barcode HAT for Pico : Bright ideas for brilliant labels by Om Singh — Kickstarter
Real Time Scanning and Storing QR Codes With Raspberry Pi and OpenCV - Tutorial Australia